Water purifier

ABSTRACT

A water purifier for supplying high purity water with a low total organic carbon content. The purifier includes removable cartridges that contain a series of organic and ion exchange purification media. Special couplings are used to permit the cartridges to be easily and quickly connected to and removed from the water purifier. In addition, the cartridges contain a check valve to minimize water drainage from the cartridge when the cartridge is removed. Selected water purifier components are constructed of fluorinated polyethylene.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a water purifier, and more particularly, to awater purifier for providing high quality reagent grade water with aresistivity of up to 18.3 megohm-cm and a total organic carbon contenton the order of 10 parts per billion.

2. Description of the Related Art

With the increasing sophistication of scientific testing and analysis,the requirements for uncontaminated water for laboratory use haslikewise increased. The purity of water is graded according to standardsestablished by professional societies. For example, Type I water is thehighest purity and is used for high performance liquid chromography,atomic absorption spectrometry, tissue culture, etc. Type II water isless pure and may be used for hematological, serological, andmicrobiological procedures. Type III water is suitable for generallaboratory qualitative analyses such as urinalysis, parasitology andhistological procedures.

The majority of impurities in potable water are in the form ofdisassociated ionized mineral salts which carry an electrical charge;and therefore, the presence of ionic contaminants is directly related tothe electrical conductivity of the water. Conversely, the absence of thewater's ability to conduct electricity is measured by its resistivity.Therefore, conductivity and its reciprocal, resistivity, are standardvariables by which the purity of water is measured. Typically,resistivity is measured in ohm-cm units at a reference temperature of25° C.; and at that temperature, absolutely pure water measures 18.3megohm-cm.

More recently, high performance liquid chromatography ("HPLC") has beenused to detect the presence of low levels of specific organic compounds.Consequently, water used in that analysis should contain no more than afew parts per billion ("ppb") of total organics.

In order to achieve the above standards of water purification, existingwater purifiers are relatively large and typically have four or morelarge canisters containing purification cartridges. In those systems,water enters the canister at the top, typically flows down through thecartridge, exits the cartridge at the bottom of the canister, and flowsup through the canister on the outside of the cartridge. Such a flowpath exposes the water to a substantial surface area after passingthrough the purification media thereby adding contaminants to thepurified water. To deal with that contamination, more purification mediais required. While the reusable canisters have a sturdy construction,the canister cartridges have a less substantial construction which maypermit purification media fines to escape the cartridge and lodge indownstream components.

In other water purification systems, several purification cartridges arepackaged together into a single purification unit which via fluidcouplings may be plugged into and unplugged from the purifier. Adisadvantage of such a system is that cartridge elements within thepurification unit may have different life cycles; and therefore, theunit life is determined by the cartridge element having the shortestlife cycle.

SUMMARY OF THE INVENTION

To overcome the disadvantages of existing water purifier systems, aprimary object of the present invention is to provide a water purifierproducing high quality reagent grade water utilizing water purifyingcartridges that may be readily connected to and disconnected from thewater purifier.

According to the principles of the present invention a water purifierhas two cartridges which contain numerous layers of purification mediato provide pure water with a resistivity of 18.3 megohm-cm and a TOCcount of less than 10 ppb. The cartridges are connected to the waterpurifier by means of couplings which permits an easy cartridge exchange.Further, each of the cartridges contains a check valve to minimize waterdrainage from the cartridge upon its removal. The purification media isrestrained within the cartridge by an end cap design that provides aseal between a porous end piece and the cartridge end cap. Further,selected water purifier components are constructed of fluorinatedpolyethylene.

The invention has an advantage of permitting individual purificationcartridges to be quickly and easily connected to and removed from thewater purifier without the use of a canister holding system or thedrainage of water from the cartridge. A further advantage is that purewater of the above specifications is provided by a water purifier thatis substantially smaller than existing units.

These and other objects and advantages of the present invention willbecome more readily apparent during the following detailed descriptiontaken in conjunction with the drawings herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front and side perspective of the water purifier.

FIG. 2 is a rear and side perspective of the water purifier.

FIG. 3 is a cross-sectional view taken along lines 3--3 of FIG. 2illustrating the purification cartridges and couplings.

FIG. 4 is a cross-sectional view taken along lines 4--4 of FIG. 3illustrating the upper cartridge coupling.

FIG. 5 is a cross-sectional view taken along lines 5--5 of FIG. 4.

FIG. 6 is a cross-sectional view taken along lines 6--6 of FIG. 3illustrating the lower coupling with the check valve open.

FIG. 6A is a cross-sectional view taken along lines 6--6 of FIG. 3illustrating the check valve in the closed position.

FIG. 6B is a cross-sectional view taken along lines 6--6 of FIG. 3illustrating an alternative embodiment of the check valve.

FIG. 7 is a cross-sectional view taken along lines 7--7 of FIG. 6.

FIG. 8 is a schematic diagram of the water purifier.

FIG. 9 illustrates an alternative embodiment of a fluid coupling member.

DETAILED DESCRIPTION

The operation of a batch feed water purifier will be described withregard to FIGS. 1, 2 and 8. Feed water pretreated with a distillationprocess, reverse osmosis process or deionization process may be pouredinto a feed water tank 12 by removing a cap 13 of the batch feed waterpurifier 10. The feed water tank 12 has an overflow valve 14 connectedto an overflow tube 16 for draining excessive water from the feed watertank. A low water level sensor and switch 18 are effective to shut offan electric motor 20 driving a pump 22. In an alternative embodiment,the water purifier system may be connected directly to a source ofdistilled, reverse osmosis or deionized water; and the feed water tank12 would be replaced by a pressure reducer connected to the pump input.

The water purification is effected by a series of organic and ionexchange purification media contained within the water purifiercartridges 26 and 34. A control panel 24 operates with electricalswitches and circuits to turn power on and off, to select a continuousrun mode, and to select a standby mode. In the continuous run mode, theelectric motor 20 drives the pump 22 which pumps water from an outlet 23at the bottom of the feed water tank 12 into an inlet 28 at the bottomof a pretreatment cartridge 26. The water flows up through severallayers of purification media and through an outlet 30 at the top end ofthe cartridge 26. The water then passes through an inlet 32 at the topof a high purity, low TOC cartridge 34. After passing through severaladditional purification media, pure water is discharged through anoutlet 36 at the bottom of the cartridge 34 which has a resistivity ofup to 18.3 megohm-cm and a TOC count in the order of 10 ppb.

The water then passes through an in-line well which contains a puritycell 38. The purity cell is operative with the control panel 24 toprovide a reading of the resistivity of the water. The water thenrecirculates back into the feed water tank 12 through the check valve41. A purity cell that may be used with the present invention isidentical to the cell and cell well used in the purity meter Part No.PC550X1A available from the assignee of the present invention.

Pure water is an active solvent and will attempt to chemically reactwith all surfaces within the purifier thereby introducing contaminantsfrom those surfaces. Therefore, in the continuous run mode, the waterfrom the feed tank is continuously pumped through the cartridges andback into the feed tank. In the stand-by mode of operation, the motorand pump are operated to recirculate the water through the cartridges onan intermittent basis, for example, for ten minutes out of every hour.

Pure water may be obtained from the purifier 10 by manually activatingthe valve 40 and permitting water to flow through a final filter 42 intocontainer 44 shown in phantom in a position removed from the purifier. Adust cover 43 helps to keep airborne impurities from the junction wherethe container 44 connects to the purifier. The check valve 41 provides asmall backpressure to force the water through the filter 42. The filter42 has a 0.2 micron pore size which is effective for removing submicronbacteria and particulates from the water. Such a filter is commerciallyavailable as part No. FL703X2 from the assignee of the presentapplication.

Referring to FIG. 3, cartridge 26 is an upflow pretreatment cartridgewhich contains 3 layers of purification media. The cartridge iscommercially available as part No. D50230 from the assignee of thepresent application. A first purification media 50 is approximately0.0055 cubic feet of granular activated carbon, 20×50 mesh, and iscommercially available as part No. CM502X6 from the assignee of thepresent invention. This first stage removes organic materials andchlorine, and the purification media 50 may be comprised of either oneor a mixture of available acid washed carbons. Acid washed carbons areused because they contain fewer soluble organics that will leach intothe water being purified; and therefore, the water passing from thecarbon to the following mixed bed resin contains less ioniccontamination from the carbon. Hence the life of the mixed bed resin isextended, and the whole system is more efficient. The media 50 may be amixture of approximately 50% by volume of high efficiency, highly activemetallurgical grade bituminous carbon and approximately 50% by volume ofhigh efficiency, highly active coconut shell carbon. Such a mixture iseffective to remove organic contaminants over a relatively wide range ofmolecular weights.

A second layer of purification media 52 is approximately 0.0055 cubicfeet of strong base macroreticular anion, commercially available as partNo. CM502X4 from the assignee of the present invention. This media is achloride form resin that has a unique pore size design to removecolloidal particulates. Colloids are very slightly ionized extremelysmall particles that may clog conventional filtration and reduce theeffectiveness of the deionization resin. Therefore colloids are removedat an early stage of the filtration process. The above purificationprocess is used if the feed water has been pretreated with adeionization process. If the feed water has been treated by adistillation or a reverse osmosis process, the colloids have alreadybeen removed; and this second layer of purification media may beeliminated.

A third layer of purification media 56 is approximately 0.0109 cubicfeet high purity mixed bed of semiconductor grade resin in which the mixis 40% strong acid cation and 60% strong base anion. The cation removalresin typically has hydrogen ions attached to its structure and iscapable of exchanging for positively charged ions. The anion resintypically has hydroxyl groups attached to its structure and is capableof exchanging for negatively charged ions. The utilization of a mixedbed purification layer results in more efficient deionization allowingthe water to polish up to 18.3 megohm-cm.

The water then passes through the outlet 30 of the first cartridge 26and is piped by a flexible hose 31 to the inlet 32 of a downflow, highpurity, low TOC four layer cartridge 34. A first layer of purificationmedia 60 is identical to the layer of purification media 50 previouslydescribed and is a second stage of organic filtering for removingorganic materials that were able to pass through the cartridge 26. Asecond layer of purification media 62 is a second stage of ion exchangefor removing ionic contaminants and is identical to the layer ofpurification media 56 previously described. This second stage ofdeionization polishes the water resistivity up to 18.3 megohm-cm. Athird layer of purification media 64 is comprised of approximately0.0025 cubic feet of high efficiency synthetic bead activated carbonwhich is commercially available as part No. CM502X3 from the assignee ofthe present invention. This stage of purification is effective inremoving trace levels of organic materials.

A fourth layer of purification media 66 in cartridge 34 is comprised ofapproximately 0.0057 cubic feet of a mixture of 10% high efficiencysynthetic bead activated carbon identical to that used in purificationlayer 64 and 90% semiconductor grade mixed bed composed of 40% strongacid cation and 60% strong base anion. The purification media 66 iscommercially available as part No. 31053 from the assignee of thepresent invention. This stage is a combination of organic removal anddeionization and effects final removal of trace levels of organics aswell as a final polishing of the water resistivity.

The easy and quick removal of the cartridges 26 and 34 from the waterpurifier 10 is facilitated by fluid couplings which represent a furtherfeature of the invention. FIGS. 4 through 7 and FIG. 9 illustrate acartridge construction which may be applied to either or both of thecartridges 26 and 34. FIGS. 4 and 5 illustrate an upper fluid coupling150 which is located at the top of a cartridge. The upper fluid coupling150 is comprised of a first member 152 connected to the water purifierand a second member 154 connected to the upper end cap assembly 156. Thepurifier further has a hole 160 for receiving the second member 154.Extending from the hole 160 is a slot 172 with a longitudinal axisparallel to the vertical direction. To connect the cartridge to thewater purifier, the first member 152 is raised to a position illustratedin phantom in FIG. 4. The second member is moved in a first, horizontal,direction through the hole 160 and is then slidably moved intoengagement with the first member 152. O-rings 162 provide a watertightseal between the coupling members 152 and 154. The first and secondmembers 152 and 154 have internal passages 153 and 155, respectively,providing a fluid path through the upper fluid coupling between the topof the cartridge and the water purifier.

Located near one end of the first member 152 is an annular flange 157and a pair of diametrically opposed tabs 158. The first member 152 ismounted in the water purifier by inserting the pair of tabs 158 throughslot 159 in bracket 161. The first member 152 is then rotated 90° to theorientation shown in FIGS. 4 and 5, to hold the first member 152 andrestrain it from motion in the horizontal direction. However, the slot159 has a length approximately equal to the length of the slot 172 andthe diameter of the hole 160. Therefore, the member 152 is free to movevertically upward in the slot 159 to permit engagement with ordisengagement from the second member 154. When the coupling 150 isdisconnected, the first member 152 is held in its upper most positionshown in phantom in FIG. 4 by a biasing force provided by the hose 31connected to the first member.

FIG. 6 illustrates a lower fluid coupling 164 which is located at thebottom of the cartridge. The lower fluid coupling 164 is comprised of athird member 166 connected to the water purifier, and a fourth member168 connected to the bottom end cap assembly 122. After the firstcoupling has been engaged by sliding the member 154 in the horizontaldirection into the member 152, the cartridge may be moved in a second,vertically downward direction to slidably move the third member 166 intothe fourth member 168. O-rings 170 provide a watertight seal between thefluid coupling members 166 and 168. The third and fourth members 166 and168 have internal passages 167 and 102, respectively, providing a fluidpath through the lower fluid coupling 164 between the bottom of thecartridge and the water purifier.

The second member 154 of the first coupling 150 has a groove 174 whichengages the slot 172 as the cartridge is moved in the verticallydownward direction to engage the second coupling. Consequently, theengagement of the second coupling at the bottom of the cartridgesimultaneously results in the first coupling 150 being locked againstmotion in the horizontal direction. Referring to FIG. 2, a hinged cover176 contains a plate 178 that is located above the upper end capassembly 156 upon the cover being closed. The plate 178 prohibits motionof the cartridges 26 and 34 in the vertical upward direction, therebypreventing the third and fourth members of the lower fluid coupling fromseparating. In the illustrated embodiment, the first and seconddirections are perpendicular to each other.

Near one end of the third member 166 is an annular flange 169 and a pairof diametrically opposed tabs 171. The third member is mounted in thewater purifier by inserting the tabs 171 through slot 175 in base plate177. The third member 166 is then rotated 90° to the orientation shownin FIG. 7, thereby to hold the third member and restrain it from motionin the vertical direction. The passage 167 in the third member 166 isformed to receive a check valve 179 to prevent water from flowing fromthe water purifier through the third member 166 upon the removal ofcartridge 96. An example of such a check valve is Part No. 110PPV-1/2#commercially available from Smart Products.

As described, coupling members 152 and 166 are identical with theexception that coupling member 166 is adapted to receive a check valve.Coupling member 187 illustrated in FIG. 9 is an alternative embodimentof coupling member 152 and 166. In some applications, it may bedesirable that the bracket 161 or base plate 177 have a largerthickness. Therefore, the coupling member 187 has an annular step 181and a stepped area 183 on the pair of tabs 191. Further, the mating slotwould be larger to accommodate the larger stepped diameter so that themating slot is held between the annular step 181 and stepped area 183.Although the coupling members 152, 166 and 187 have been illustrated as90° elbows, those coupling members may alternatively be straightcouplings.

Each of the cartridges 26 and 34 contain a check valve whichautomatically closes when the cartridges are removed from the waterpurifier, thereby preventing water from draining from the cartridges.FIGS. 6, 6A and 7 illustrate the construction of a purificationcartridge including a check valve which may be used in either or both ofthe cartridges 26 and 34. A purification cartridge 96 is comprised of acartridge tube 98 including a lower end cap assembly 122 and an upperend cap assembly 156. The end cap assemblies 122 and 156 are joined tothe cartridge tube 98 to contain the fluid and purification media withinthe cartridge. A check valve 99 is comprised of a stem 100 which isslidably located within a cylindrical channel 102 at one end of thelower end cap assembly 122. The upper end of the cylindrical channeltapers outwardly relative to a longitudinal axis of the channel to forma first annular bearing surface 104. The upper end of the stem 100 alsotapers outwardly relative to its longitudinal axis to form a secondannular bearing surface 106 which is located opposite to and mates withthe first annular bearing surface 104. The water purifier contains alocating surface 108. When the cartridge is connected to the waterpurifier, the stem 100 contacts the locating surface 108, therebycausing relative motion between the stem 100 and the channel 102. Thatmotion separates the second annular bearing surface 106 from the firstannular bearing surface 104, thereby providing a fluid path through thechannel 102, past the stem 100 and past the purification media 120. Asshown in FIG. 7, the stem has four flutes 110 equally spaced about itslongitudinal axis 112. As illustrated in FIG. 6A, as the cartridge isremoved from the water purifier, the stem 100 loses contact with thelocating surface 108, thereby allowing the stem to move downwardly inthe cylindrical channel 102. The second annular bearing surface 106moves into contact with the first annular bearing surface 104, therebyblocking the fluid path.

The embodiment illustrated in FIGS. 6 and 7 includes a spring 114located between a porous end piece 116 and the stem 100. The springprovides a biasing force to bring the first and second annular bearingsurfaces into contact. In addition, an O-ring 118 located on the stemfor providing a seal between the first and second annular bearingsurfaces. While the spring 114 and O-ring 118 have the advantage ofmaintaining a watertight seal regardless of the orientation of thecartridge, the inclusion of those elements has the disadvantage ofpotentially adding contaminants to the purified water. Consequently, ina second embodiment of the invention shown in FIG. 6B, the spring 114and O-ring 118 are not utilized; and gravitational forces acting on thestem are effective to bring the first and second annular bearingsurfaces into contact.

FIG. 6 illustrates a further feature of the invention by which thepurification media 120 is contained within the cartridge 96 by the endcap assemblies 122 and 156. Referring to the end cap assembly 122illustrated in FIG. 6, the cylindrical channel 102 provides a fluid pathfor the water. In addition, the porous end piece 116 is supported onblocks 126. The porous end piece 116 permits water to pass therethroughbut is effective to maintain the purification media 120 within thecontained volume defined by the cartridge 98 and end cap assemblies 122and 156. To secure the end piece 116 in place and to provide a seal thatprevents passage of the purification media 120, it is desirable to sealthe joint between the outer diameter of the porous end piece and itsadjoining member. Attempting to seal the joint itself presentsmanufacturing problems and requires close dimensional tolerances of theporous end piece and its adjoining member. Present designs do notprovide a complete seal of the outer joint; and therefore, purificationmedia fines may pass through the joint and lodge in downstreamcomponents. The end cap assembly of the present invention eliminatesthose problems by providing an interior wall 128 surrounding the porousend piece. Utilizing an ultrasonic process, an annular edge 130 of thewall 128 is heated and swagged into contact with the porous end piece116, thereby holding the porous end piece in position and providing apositive seal preventing the purification media from passing by theporous end piece. In the preferred embodiment, the heating and swaggingprocess results in the edge 130 of the interior wall 128 fusing to thesurface of the porous end piece 116.

While the water purifier has been described as using pretreated feedwater, untreated feed water may also be used; however, the efficiency ofoperation and life of the purification media is substantially reduced.The water purifier components which come into contact with the water,for example, feed water tank, tubing and fittings, valve parts, pumpparts, purity cell well, cartridge housing and parts and canistersholding cartridges, etc., may be constructed of any material whichsubstantially limits solvent absorption by the water of contaminantsfrom those components. For example, those components may be constructedfrom Teflon®, polypropylene, PVDF, etc. Applicant's have found thatthose components may also be constructed of fluorinated polyethylene oranother fluorinated thermoplastic. Such a material is produced by aprocess in which fluorine gas is concentrated in a chamber holding thewater purifier component, and the temperature, pressure and exposuretime are controlled to create a permanent fluorocarbon barrier on allinternal and external surfaces on the component. This chemicaltransformation restructures the molecules of the surfaces exposed to thefluorine gas to form a fluorocarbon skin which is very low in TOCextractables.

While the invention has been illustrated in some detail according to thepreferred embodiments shown in the accompanying drawings, and while thepreferred embodiments have been described in some detail, there is nointention to thus limit the invention to such detail. On the contrary,it is intended to cover all modifications, alterations and equivalentsfollowing within the spirit and scope of the appended claims.

What is claimed is:
 1. A batch feed water purifier connected to feedwater for providing pure water having a resistivity of up to 18.3megohm-cm and a total organic carbon content of up to 10 parts perbillion, the batch feed water purifier comprising:a tank having an inletfor receiving the feed water, and the tank storing the pure water; amultilayer purification media disposed in a housing means having aninlet in fluid communication with the tank and having an outletproviding the pure water, the purification media includinga first layerof a mixture including at least two acid washed, granular activatedcarbons, a successive second layer of mixed bed semiconductor graderesin comprising a strong acid cation resin and a strong base anionresin, a successive third layer of synthetic bead activated carbon, anda successive fourth layer of a mixture including a synthetic beadactivated carbon and a mixed bed of semiconductor grade resin comprisinga strong acid cation resin and a strong base anion resin; a pumpconnected between the tank and the multilayer purification media forcirculating the feed water and recirculating the pure water through themultilayer purification media and the tank; and a filter means in fluidcommunication with the outlet of the multilayer purification media forfiltering submicron bacteria and particulates.
 2. The batch feed waterpurifier of claim 1 wherein the first layer of the multilayerpurification media comprises a 20×50 mesh mixture of an acid washedmetallurgical grade bituminous carbon and a coconut shell carbon.
 3. Thebatch feed water purifier of claim 1 wherein the successive second layerof the multilayer purification media further comprises a mixed bed ofsemiconductor grade resin including approximately 40% strong acid cationresin and approximately 60% strong base anion resin.
 4. The batch feedwater purifier of claim 1 wherein the successive fourth layer of themultilayer purification media further comprises a mixture containingapproximately 10% synthetic bead activated carbon and approximately 90%mixed bed of semiconductor grade resin composed of approximately 40% ofstrong acid cation resin and approximately 60% strong base anion resin.5. The water purifier of claim 1 wherein the feed water is pretreatedwith a deionization process and the multilayer purification mediafurther includes an additional layer of purification media locatedbetween said first and said second purification layers, the additionallayer comprising a macroreticular anion chloride form resin for removingcolloids.
 6. The water purifier of claim 1 wherein the filter means hasa 0.2 micron pore size.
 7. The batch feed water purifier of claim 1wherein the tank is constructed of a fluorinated polyethylene material.8. A batch feed water purifier for providing pure water having aresistivity of up to 18.3 megohm-cm and a total carbon content of up to10 parts per billion .by circulating feed water and recirculating thepure water through a multilayer water purification media and a tankstoring the pure water, said batch feed water purifier including ahousing means containing the multilayer water purification media, themultilayer water purification media comprising:a first layer of amixture in fluid communication with the tank and including at least two20×50 mesh, acid washed, granular activated carbons; a successive secondlayer of mixed bed semiconductor grade resin comprising a strong acidcation resin and a strong base anion resin; a successive third layer ofa synthetic bead activated carbon; a successive fourth layer producingthe pure water and comprising a mixture including a synthetic beadactivated carbon and a mixed bed semiconductor grade resin having astrong acid cation resin and a strong based anion resin.
 9. The batchfeed water purifier of claim 8 wherein the first layer comprises amixture of an acid washed metallurgical grade bituminous carbon and acoconut shell carbon.
 10. The batch feed water purifier of claim 8wherein the housing means comprises a first cartridge containing saidfirst, second third, and fourth layers, and whereinthe first layerfurther comprising approximately 0.0055 cubic feet of a 20×50 mesh mixof approximately 50 percent by volume of an acid washed metallurgicalgrade bituminous carbon and approximately 50 percent by volume of acoconut shell carbon; and the successive second layer comprisesapproximately 0.0109 cubic feet of a mixed bed semiconductor grade resinincluding approximately 40% strong acid cation resin and approximately60% strong base anion resin.
 11. The batch feed water purifier of claim8 wherein the housing means further comprises a second cartridge, saidsecond cartridge containinga fifth layer comprising approximately 0.0055cubic feet of a 20×50 mesh mix of approximately 50 percent by volume ofan acid washed metallurgical grade bituminous carbon and approximately50 percent by volume of a coconut shell carbon; successive sixth layerfurther comprising approximately 0.0109 cubic feet of a mixed bed ofsemiconductor grade resin including approximately 40% strong acid cationresin and approximately 60% strong base anion resin; with the successivethird layer being adjacent the sixth layer and further comprisingapproximately 0.0025 cubic feet of synthetic bead activated carbon; andthe successive fourth layer further comprising approximately 0.0057cubic feet of a mixture containing 10% synthetic bead activated carbonand 90% mixed bed semiconductor grade resin composed of 40% of strongacid cation resin and 60% strong base anion resin.
 12. The batch feedwater purifier of claim 8 wherein the housing means comprises a firstcartridge containing said first, second, third, and fourth layers, andwhereinthe first layer comprises approximately 0.0055 cubic feet of a20×50 mesh mix of approximately 50 percent by volume of an acid washedmetallurgical grade bituminous carbon and approximately 50 percent byvolume of a coconut shell carbon; an additional layer is disposed afterthe first layer, said additional layer comprising approximately 0.0055cubic feet of strong base macroreticular anion chloride form resin; andthe successive second layer adjacent the additional layer comprisesapproximately 0.0109 cubic feet of a mixed bed of semiconductor graderesin including approximately 40% strong acid cation resin andapproximately 60% strong base anion resin.
 13. The batch feed waterpurifier of claim 8 wherein the housing means further comprises a secondcartridge, said second cartridge containinga fifth layer comprisingapproximately 0.0055 cubic feet of a 20×50 mesh mix of an acid washedgranular activated carbon; a successive sixth layer further comprisingapproximately 0.0109 cubic feet of a mixed bed of semiconductor graderesin including approximately 40% strong acid cation resin andapproximately 60% strong base anion resin; the successive third layeradjacent the sixth layer and further comprising approximately 0.0025cubic feet of synthetic bead activated carbon; and the successive fourthlayer further comprising approximately 0.0057 cubic feet of a mixturecontaining 10% synthetic bead activated carbon and 90% mixed bedsemiconductor grade resin composed of 40% of strong acid cation resinand 60% strong base anion resin.
 14. A batch feed water purifierconnected to feed water for providing pure water having a resistivity ofup to 18.3 megohm-cm and a total organic carbon content of up to 10parts per billion comprising:a tank having an inlet for receiving thefeed water and the tank storing the pure water; a first multilayerpurification cartridge having an inlet in fluid communication with thetank, the first multilayer purification cartridge containinga firstlayer of purification media comprising approximately 0.0055 cubic feetof a mix of approximately 50 percent by volume of an acid washedmetallurgical grade bituminous carbon and approximately 50 percent byvolume of a coconut shell carbon, and a successive second layer ofpurification media comprising approximately 0.0109 cubic feet of a mixedbed semiconductor grade resin including approximately 40% strong acidcation resin and approximately 60% strong base anion resin; a secondmultilayer purification cartridge having an inlet connected to an outletof the first multilayer purification cartridge, the second multilayerpurification cartridge including an outlet in fluid communication withthe tank, the second multilayer purification cartridge includingasuccessive third layer of purification media comprising approximately0.0055 cubic feet of a 20×50 mesh of an acid washed granular activatedcarbon, a successive fourth layer of purification media comprisingapproximately 0.0109 cubic feet of a mixed bed of semiconductor graderesin including approximately 40% strong acid cation resin andapproximately 60% strong base anion resin, a successive fifth layer ofpurification media comprising approximately 0.0025 cubic feet ofsynthetic bead activated carbon, and a successive sixth layer ofpurification media comprising approximately 0.0057 cubic feet of amixture including 10% synthetic bead activated carbon and 90% of a mixedbed of semiconductor grade resin including approximately 40% strong acidcation resin and approximately 60% strong base anion resin; a pumpconnected between the tank and the first multilayer purificationcartridge for circulating the feed water and recirculating the purewater through the first and the second multilayer purificationcartridges and the tank; and a filter in fluid communication with theoutlet of the second multilayer purification cartridge, the filterhaving an approximately 0.2 micron pore size; and a manually actuatedvalve connected with the filter and the outlet of the secondpurification cartridge for controlling the discharge of the pure waterfrom the water purifier.
 15. The batch feed water purifier of claim 14wherein the first multilayer purification cartridge further including aseventh layer of purification media comprising approximately 0.0055cubic feet of a strong base chloride form macroreticular anion resin,the seventh layer of purification media being located between the firstand the second layers of purification media.